Disclosure context

About kazu

The Kazu ransomware group is a relatively new threat actor that emerged in November 2025, operating with apparent financial motivations based on their targeting patterns across multiple sectors and geographic regions. Given their recent emergence and limited public documentation, details about their country of origin and potential affiliations remain unclear, though their targeting of diverse international victims suggests either a ransomware-as-a-service model or an independent operation with broad reach capabilities. With only nine documented victims to date, specific details about Kazu's attack methodology, initial access vectors, and encryption techniques have not been extensively documented by major threat intelligence organizations, though their targeting spans healthcare, public sector, financial services, and technology organizations across the United States, Colombia, South Africa, Nigeria, and Great Britain. The group's recent emergence means there are no widely reported major campaigns or high-profile incidents documented by established security research organizations like Mandiant, CISA, or the FBI. As of the latest available intelligence, Kazu appears to remain active given their very recent first observation date, though their limited victim count and recent emergence make definitive assessments of their operational status preliminary. The group has been linked to 12 public disclosures across our corpus. First observed on a leak site on November 11, 2025; most recent post May 20, 2026. The operation is currently active.

Timeline of this disclosure

November 11, 2025National Civil Service Commission of Colombia listed by kazuon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Public Sector sector, which has 259 disclosures indexed across all operators we track. Geographically, National Civil Service Commission of Colombia is reported in CO, a country with 9 ransomware disclosures in our corpus.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.

Ransomware victim disclosure

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National Civil Service Commission of Colombia

Claimed by kazu · listed 6 months ago

Age

since listed · data leaked

Status timeline

Listed
Nov 11, 2025
Data leaked

At a glance

Group: kazu
Status: Data leaked
Country: CO
Sector: Public Sector
Listed on leak site: Nov 11, 2025

About the victim

AI dossier — public-source company profile

The Comisión Nacional del Servicio Civil (CNSC) is a Colombian national government body responsible for administering and overseeing the civil service career system ('carrera administrativa') for public sector employees across Colombia. It manages competitive selection processes for thousands of civil service vacancies, maintains the public registry of career civil servants, and regulates performance evaluations and personnel commissions for national and territorial public entities.

Industry: Government Civil Service Administration
Address: Carrera 22 No. 38-65, Bogotá, Colombia
Employees: 51-200

Attack summary

Severity: critical — The CNSC is a national government institution holding large-scale PII on civil servants and applicants across Colombia, including personnel records, selection process data, and potentially identity and employment data of public employees nationwide. Data_published status indicates confirmed exfiltration from a government entity handling regulated public-sector personal data at scale.

The ransomware group Kazu claims to have compromised the CNSC and has published data ('data_published' status), though the leak post itself is minimal and provides no explicit description of the exfiltrated data volume or type. No ransom amount was stated.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Civil service applicant records
Government employee personnel data
Selection process documentation
Administrative and financial information
Citizen petition and service records

What the group claims

The official portal of the Comisión Nacional del Servicio Civil (CNSC), Colombia’s National Civil Service Commission. This government body is responsible for overseeing the recruitment, selection, and management of public servants in the country. It ensures that hiring for government positions is fair, transparent, and based on merit. The site provides essential information about job openings in the public sector, application processes, and the regulations that govern public service employment in Colombia. It serves as a key resource for individuals seeking to apply for civil service positions or learn about public sector employment in Colombia

The leak post

captured from the group's site

Apache/2.4.65 (Debian) Server at 6czlbd2jfiy6765fbnbnzuwuqocg57ebvp3tbm35kib425k4qnmiiiqd.onion Port 80

Sources

Victim sitecnsc.gov.co
Leak posthttp://6czlbd2jfiy6765fbnbnzuwuqocg57ebvp3tbm35kib425k4qnmiiiqd.onion/ransom.html#National

Source

Indexed 6 months ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.